How big can a raid 5 get?

D

delemorte

Gawd
Joined
Sep 5, 2006
Messages
680
Is there a theoretical size limitation to a raid 5 array?

Mother board is a ASUS with a Intell Matrix Storage Manager raid controller on it.

4 Samsung drives 1.5. TB a piece.

I can make the raid 5 out of all 4 drives but it only gives me a max volume of 2.2 TB. I can add a second volume from the same array equalling 2.2 TB but did not know if this was a limitation of how large an array can be or how large my Raid controller can support. Latest BIOS and firmware have been installed.

Push comes to shove i can live with 2 large volumes but would like to know why i cant make just one.
 
i would like to think that the volume size limitation is os based, but im not sure (it shouldnt be... but it shouldnt be at the controller either)

wierd...
 
I strong suggest you do not make raid sets larger than 2 TB. As most data recovery apps don't support them.
 
lt_shiro said:
I strong suggest you do not make raid sets larger than 2 TB. As most data recovery apps don't support them.
Click to expand...

Thats an excelent point.

And i just checked. Windows does not recognize the whole 2.2. It only recognizes 1.99 TB So there is 400 GB out there unaccounted for...


HMMM...
 
This is what i found on another site. Looks like it does not matter.


"Hi,



Based on my research, for NTFS "The maximum partition size is 2TB. NTFS actually has an upper limit of 16 Exabyte (quintillion bytes, or 16 million TB), but since current industry standard limits the Partition Tables to 2 to the 32nd power sectors (with 512B sectors, that's 2 TB), the actual current upper limit is 2 TB.




However, as for GPT partition, NTRS can support 256T.

More infomramtion, please refer to the artile below:

Windows and GPT FAQ
http://www.microsoft.com/whdc/device/storage/GPT_FAQ.mspx

Hope this helps."
 
make a 4x1.5 raid 0 array and hold on for deal life.. its freaking fast... (partition out the disks into 1tb sections and cross your fingers that it wont fail... lol )

it would be fun to play around with, but very practile

should be able to sustain 900+mb transfers with bursts in the 1200 to 1500 range
 
Thor said:
make a 4x1.5 raid 0 array and hold on for deal life.. its freaking fast... (partition out the disks into 1tb sections and cross your fingers that it wont fail... lol )

it would be fun to play around with, but very impractile

should be able to sustain 900+mb transfers with bursts in the 1200 to 1500 range
Click to expand...


HAHAHA... Ill pass. Let me know how it goes if you try it.
 
been there done that... currently running older 80gb hd's no money to upgrade.. but at one point in time i had them set like that.. currently they are set to 2x80 r0+2x80 r0 with a 200gb back up drive where i acctually store every thing just incase one of the arrays goes down... however, i have been running this stripe set for nearly 3 years now and i've never had a problem with it..
 
Ran into a similar issue on an ASUS P5N-D. After some non friendly amount of forum hunting, I discovered Asus doesn't support arrays larger than 2TB on that board. I wouldn't be anywhere near to surprised if it's the same for your board (hardware more than supports it though, so I made my decision to never buy Asus again, but hey consumer's choice).

As for your OS reporting the wrong amount, you'll need 64 bit windows and a GPT table to get past the 2TB cap.
 
Thor said:
make a 4x1.5 raid 0 array and hold on for deal life.. its freaking fast... (partition out the disks into 1tb sections and cross your fingers that it wont fail... lol )

it would be fun to play around with, but very practile

should be able to sustain 900+mb transfers with bursts in the 1200 to 1500 range
Click to expand...

You should be able to find some numbers on such arrays here:

Post your HD Tune Scores
 
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